Don't know about the 1.6 rockers but, we ran a set of 1.5s on the wife's 'Cuda. We ran them with a Crane solid roller cam for 4 years with no problems. Never any issues with the shafts or the roller tips.
The only reason we are not running them now is that the heavy spring loads caused the bottom side of the rockers to crack. This is the same thing that happened to the Crane gold rockers we first tried.
The engine by the way is a 440 Source stroker 512" that has been running and raced for 6 years now. I am sure there is a good reason to bash 440 Source stuff but, not all of us are made of money and have to try to save money where we can. If that means that I have to go against the popular ideals and buy from someone that I can afford their parts so be it. I normally don't rave on but I just felt I had to vent.
Mike (Digger73)